The poor electrical conductivity of metal-organic frameworks (MOFs) limits their electrocatalytic performance in the oxygen evolution reaction (OER). In this study, a Py@Co-MOF composite material based on pyrene (Py) molecules and {[Co₂(BINDI)(DMA)₂]·DMA}_n (Co-MOF, H₄BINDI=N,N′-bis(5-isophthalic acid)naphthalenediimide, DMA=N,N-dimethylacetamide) was synthesized via a one-pot method, leveraging π-π interactions between pyrene and Co-MOF to modulate electrical conductivity. Results demonstrate that the Py@Co-MOF catalyst exhibited significantly enhanced OER performance compared to pure Co-MOF or pyrene-based electrodes, achieving an overpotential of 246 mV at a current density of 10 mA·cm^-2 along with excellent stability. Density functional theory (DFT) calculations reveal that the formation of O^* in the second step is the rate-determining step (RDS) during the OER process on Co-MOF, with an energy barrier of 0.85 eV due to the weak adsorption affinity of the OH^* intermediate for Co sites.

A unique 3D luminescent metal-organic framework, namely [Cd(L)(H₂O)_0.5]·DMF·2.5H₂O (1), where H₂L=3-(tetrazol-5-yl)triazole, has been successfully prepared and characterized. The framework has demonstrated excellent luminescence properties and structural stability in the water system. Notably, the luminescence intensity of 1 was significantly quenched by Cr(Ⅵ) (1 mL of Cr₂O₇^2- or 150 μL of CrO₄^2-, 1 mmol·L^-1), leading to the formation of an "on-off" luminescence silencing system (Cr₂O₇^2-@1), which was capable of accurately detecting Cr(Ⅵ) in the water system. The primary mechanism responsible for luminescence quenching was the Forster resonance energy transfer (FRET) process. Additionally, by removing the involvement of the FRET process, the luminescence intensity of the Cr₂O₇^2-@1 system could be restored, allowing for the highly selective and sensitive detection of ascorbic acid (AA) in water systems. Moreover, it has been demonstrated that 1 can successfully detect AA in vitamin C tablets, yielding recovery rates ranging from 98.20% to 103.33% and relative standard deviations (RSDs) ranging from 1.78% to 3.42%. Based on the findings of this experiment, a luminescent "IMPLICATION" molecular logic gate has been constructed utilizing AA and Cr(Ⅵ) as the chemical inputs, respectively.